Cruiser is a large surface warship with strong firepower and many uses, mainly engaged in ocean activities. The cruiser is equipped with strong offensive and defensive weapons, has high speed and seaworthiness, and can conduct long ocean operations in harsh weather conditions. The main task is to escort aircraft carriers and battleships, or form a maritime mobile formation as the flagship of the formation to attack enemy surface ships, submarines or shore targets. After World War II, most countries have stopped building cruisers. Only the United States and the Soviet Union have built several classes, such as the Ticonderoga class of the United States and the Kirov class of the Soviet Union; In the 21st century, cruisers will gradually be replaced by destroyers, which will become history.